package com.bravo.bravomerchant.util;

import java.math.BigDecimal;

public class ArithUtil {
	
	private static final int DEF_DIV_SCALE=10;

	public static double add(double d1,double d2){
		BigDecimal b1=new BigDecimal(Double.toString(d1));
		BigDecimal b2=new BigDecimal(Double.toString(d2));
		return b1.add(b2).doubleValue();
		
	}
	
	public static double sub(double d1,double d2){
		BigDecimal b1=new BigDecimal(Double.toString(d1));
		BigDecimal b2=new BigDecimal(Double.toString(d2));
		return b1.subtract(b2).doubleValue();
		
	}
	
	public static double mul(double d1,double d2){
		BigDecimal b1=new BigDecimal(Double.toString(d1));
		BigDecimal b2=new BigDecimal(Double.toString(d2));
		return b1.multiply(b2).doubleValue();
		
	}
	
	public static double div(double d1,double d2){

		return div(d1,d2,DEF_DIV_SCALE);
		
	}
	
	public static double div(double d1,double d2,int scale){
		if(scale<0){
			throw new IllegalArgumentException("The scale must be a positive integer or zero");
		}
		BigDecimal b1=new BigDecimal(Double.toString(d1));
		BigDecimal b2=new BigDecimal(Double.toString(d2));
		return b1.divide(b2,scale,BigDecimal.ROUND_HALF_UP).doubleValue();
		
	}
}
